Define accelerated steps time function.

ui/gfx/gfx_tests.gyp

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'targets': [
     {
@@ skipping 12 matching lines @@
         'image/image_unittest_util_mac.mm',
         'screen_unittest.cc',
         'test/run_all_unittests.cc',
         'text_elider_unittest.cc',
         'text_utils_unittest.cc',
       ],
       'all_sources': [
         '<@(_common_sources)',
         'animation/animation_container_unittest.cc',
         'animation/animation_unittest.cc',
+        'animation/cubic_bezier_unittest.cc',
         'animation/multi_animation_unittest.cc',
         'animation/slide_animation_unittest.cc',
+        'animation/steps_unittest.cc',
         'animation/tween_unittest.cc',
         'blit_unittest.cc',
         'break_list_unittest.cc',
         'canvas_unittest.cc',
         'canvas_unittest_mac.mm',
         'codec/jpeg_codec_unittest.cc',
         'codec/png_codec_unittest.cc',
         'color_analysis_unittest.cc',
         'color_utils_unittest.cc',
         'display_change_notifier_unittest.cc',
         'display_unittest.cc',
         'font_list_unittest.cc',
         'geometry/box_unittest.cc',
-        'geometry/cubic_bezier_unittest.cc',
         'geometry/insets_unittest.cc',
         'geometry/matrix3_unittest.cc',
         'geometry/point_unittest.cc',
         'geometry/point3_unittest.cc',
         'geometry/quad_unittest.cc',
         'geometry/r_tree_unittest.cc',
         'geometry/rect_unittest.cc',
         'geometry/safe_integer_conversions_unittest.cc',
         'geometry/size_unittest.cc',
         'geometry/vector2d_unittest.cc',
@@ skipping 127 matching lines @@
           ],
           'variables': {
             'test_suite_name': 'gfx_unittests',
           },
           'includes': [ '../../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }